98 octane only for 996tt - is this true

[Nobbles]

98 only??

[Magic919]

I would run on 98, but the car can adapt.

[AndrewMontgomery]

Car can use anything from 95ron upwards but the lower grade fuel will be detected and the timing retarded. So your performance will be blunted.

Living here in Northern Ireland you cannot get 98 ron fuel (ludicrously). I have to use 97ron.

[ukgatecrasher]

In my cay on anything less than 98, the difference in Performance is hugely noticeable, it's also a lot less smooth.

Shell v power for me only.

It does have a tune though.

[Mattt]

For the sake of a couple of quid, why bother with anything else?

[yeti]

Does this apply to all 996s i.e. do they all have a knock sensor (3.4)? Noticed the '98 RON' sticker inside my fuel cap the other day!

[FisiP1]

Mattt said:

For the sake of a couple of quid, why bother with anything else?

The nearest garage with Vpower or any other 98 fuel is more than 2hrs away from here, its not an option for many.

[Vixpy1]

97 is fine, even 95 is fine however they don't particulary like it

[Diesel130]

Nobbles said:

98 only??

No, that's bks. Shell V-Racing 102 octane is just fine

[anonymous-user]

I know 95 would cause a bit of retard, but can anyone tell the difference between 97 and 98?

[monthefish]

AndrewMontgomery said:

Living here in Northern Ireland you cannot get 98 ron fuel (ludicrously). I have to use 97ron.

Same here in West of Scotland. Always use 97ron though.
Can't believe there's that much in it between 97 and 98ron.

Mattt said:

For the sake of a couple of quid, why bother with anything else?

See above.

[Mattt]

My comment was targeted at use of 95 RON rather than 97 RON.

I class (rightly or wrongly) all 'Premium' petrols (97/98/99) the same - although I appreciate they can have different results and get there in different ways (e.g. use of bioethanol).

[ukgatecrasher]

For me at least the difference between tescos premium and v power is night and day, huge power loss and lumpy running.

[Jay964rs]

I only ever use Tesco 99 or V Power in 996tt, I can't tell any difference between the 2.
Premium car, premium fuel.

[mollytherocker]

It would seem to me to be a strange decision to buy a fast car and then effectively de-tune it.

V-Power for me on pretty much any Porsche.

MTR

[anonymous-user]

mollytherocker said:

It would seem to me to be a strange decision to buy a fast car and then effectively de-tune it.
MTR

Depends on local availability. I use 97 because that's the best my nearest local garages have available. I wouldn't go out of my way especially to get 98

[996ttalot]

The 996TT is tuned to run on 98. If you run 99 then you get better protection when intake temps rise, but as the 996TT is boost not air mass driven, running 99 will not add any real power other than allowing you to run slightly longer at higher speeds, so in other words you will retain power against using 98.

Running 95 will reduce power - it is that simple. The DME loads a different table once it has adapted.

A remapped 996tt should always be run on 99 if possible.

To give an example with boost, if you run an electronic boost controller (EBC) on a high hp car, you can run (I don't use the word gain) an additional 50-100hp by running MS109. Simply you can turn the boost up and the o2 content within the fuel will lean the AFRs, which would otherwise have headed rich.

Just run the best you can - don't run octane booster - if you want, just buy 25 litres of MS109 and use that as octane booster 5:1 ratio.

Lastly, if you are 200 miles away from good fuel, then whilst the car will run okay on 95, think about buying MS109 or something similar as an octane booster - your car will thank you

[wtdoom]

only ever use v power .
i eat good food so should my car , fairs fair .